Entwicklung und Erprobung von Verfahren zur Dichtheitspruefung bei im Rahmen des Foerderschwerpunktes entwickelten Kanalsanierungstechniken Abschlussbericht

Aim of this research project was the development of criteria for watertightness-tests on buried drains and sewers with different testing media, i.e. water, low-air pressure and vacuum. Although there are a lot of standards for watertightness-tests on new sewers among the national and international literature, there are no criteria for testing old sewer-systems. Because of the physical differences between the testing media - water is incompressible but air is highly compressible - it is impossible to compare directly the results of tightness-tests done with water or air. For this reason equations were developed with which it will be possible to compare the results independent of the used media. The results of the research project offer a scientifically proved suggestion for tightness criteria depending on the used media, i.e. water, low-air pressure or vacuum. These criteria are established in a new standard ATV-Merkblatt M 146 Part 6 'Watertightness-Tests on buried drains and sewers and manholes with water, low-air pressure and vacuum'. (orig.)SIGLEAvailable from TIB Hannover: F97B89+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman